Infection, channels of, 199 Degree of, 172 Direct, 199 Indirect, 200 Mode of, 199 Period of, 172 Source of, 23, 198 Infectious, 173, 202 Inflammable, 36 Inorganic detritus, 67 Inorganic salts, 239 Insecticide, 208 Inspiration of air, 48 Instrumental birth, 308 Intellectual adaptation, 50 Intellectual adaptation in immunity, 181 Intercepting sewers, 39 Interference with transmission, 61 Internal cleanliness, 15 Internal resistance, 54 Intussusception, 367 Major adjustment, 369 Stools in, 368 Symptoms, 368 Invasion, period of, 172 Iris, 96 Irritability, during dentition, 300 Irritation of genital organs, 387 J Jaundice, 308 K Kidneys, 60 Klebs-Loeffler bacilli, 335 Krypton, 44, 46 L Labor, effect upon children, 158 Lactalbumin, 255 Lactoglobulin, 255 Lactose, 256 Lakes, 114, 115 Languor, 59 Larvæ, of tænia saginata, 270 Laryngeal obstruction, 335 Laryngismus stridulus, 333 Laryngitis, acute catarrhal, 334 Chronic, 336 Tubercular, 337 Larynx, foreign bodies in, 338 Symptoms, 339 Larynx, incoördination of, 332 Lavatory, 37 Layman’s hygiene, 19 Lead colic, 166 Lead palsy, 166 Lead poisoning, 166 Lighting, 95 Artificial, 99, 162 Direct, 101 Incandescent electric light, 100 of schoolroom, 142 Psychological effect of, 100 Systems of, 101, 102 Physiological effect of, 100 Schoolroom, 142 Value of sunlight, 98 Window area, 98, 99 Limestone formation, 121, 123 Limestone regions, 119 Lips, tactile sensibility of, 290 Liquid disinfectants, 210 Living rooms, 30 Lobar pneumonia, 344 Symptoms of, 346 Local heating, 84 Location of work, 164 Lockjaw, 389 Loss of light, 98 Loss of seal, 38 Loss of weight, 287 Lungs, 45 Lysol, 213 M Macula lutea, 96 Main sewer, 37 Malnutrition, 373 Major adjustment, 374 Symptoms, 373 Man, as source of communication, 22 Manufactured ice, 127 Manure, 259 Marasmus, 375 Major adjustment, 375 Matron, 147 Measles, 173 Measly beef, 270 Meat, 267, 268 Care of food animals, 269 Composition of, 267 Danger to health, 270 Food value of, 268 Source of, 268 Unfit for food, 269 Mechanical devices to aid walking, 296 Mechanical filtration, 128, 131 Mechanical ventilation, 72, 164 Mechanism of immunity, 188 Meconium, 366 Media of conveyance, 198 Medical hygiene, 19 Meningitis, 382 Mental impulses, 186 Mercurial poisoning, 167 Mercury, 166 Mercury, use of, 167 Metallic cough, croup, 332 Methods of sewage disposal, 132 Methods of water purification, 126 Miasmatic, 203 Microcephalus, 293